AV6010 扫描仪摄像头电源模块 ACCU-SORT

产品标题：AV6010  扫描仪摄像头电源模块 ACCU-SORT

型号：AV6010  扫描仪摄像头电源模块 

品牌： ACCU-SORT

质保：七天验收期，质保期一年

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制造与购买：典型的桥梁应用程序错误预算
AD620提供了比“自制”更好的性能
三种运算放大器IA设计，尺寸更小、数量更少
组件，以及10倍更低的电源电流。在典型的
如图37所示，需要100的增益才能
在工业温度范围内放大20 mV满量程的电桥输出−40°C至+85°C。表4显示了如何计算各种误差源对电路精度的影响。AD620Rev。H |13页，共20页
无论使用哪种系统，AD620都能以低功耗和低价格提供更高的精度。在简单系统中，对精度和漂移误差是导致误差的重要因素。在具有智能处理器的更复杂系统中，自动增益/自动调零循环移动所有对精度和漂移误差，只留下增益、非线性和噪声的解算误差，从而允许完全14位精度。请注意，对于自制电路，输入电压偏移和噪声的OP07规格已乘以√2.这是因为三运算放大器类型的输入放大器在其输入端有两个运算放大器，这两个都会导致整体输入误差。R=350Ω10V精密桥式变换器R=350欧姆R=350ωR=350εR=35Ω00775-0-039AD620A单片仪器放大器，G=100电源电流=1.3mA大AD620A RG499Ω参考00775-0-040
图37制造与购买
“主页”IN-AMP，G=100
*0.02%电阻匹配，3ppm/°C跟踪
**离散1%电阻，100ppm/°C跟踪
P07D00775-0-041表4.制造与购买错误预算
全刻度误差源AD620电路计算“自制”电路计算AD620自制对精度在TA=25°C时的误差，ppm
输入偏移电压，μV 125μV/20 mV（150μV×√2） /20mV 6250 10607输出偏移电压，μV 1000μV/100mV/20mV（（150μV×2）/100）/20mV 500 150
输入偏移电流，nA 2 nA×350Ω/20 mV（6 nA×350欧姆）/20 mV 18 53CMR，dB 110 dB（3.16 ppm）×5 V/20 mV
对误差755911310
漂移至85°C
增益漂移，ppm/°C（50 ppm+10 ppm）×60°C 100 ppm/℃轨道×60°C3600 6000
输入偏移电压漂移，μV/°C 1μV/℃×60°C/20 mV（2.5μV/℉×√2×60°C）/20 mV 3,00Make vs. Buy: a Typical Bridge Application Error Budget
The AD620 offers improved performance over “homebrew”
three op amp IA designs, along with smaller size, fewer
components, and 10× lower supply current. In the typical
application, shown in Figure 37, a gain of 100 is required to
amplify a bridge output of 20 mV full-scale over the industrialtemperature range of −40°C to +85°C. Table 4 shows how tocalculate the effect various error sources have on circuitaccuracy. AD620Rev. H | Page 13 of 20
Regardless of the system in which it is being used, the AD620provides greater accuracy at low power and price. In simplesystems, absolute accuracy and drift errors are by far the mostsignificant contributors to error. In more complex systemswith an intelligent processor, an autogain/autozero cycleemoves all absolute accuracy and drift errors, leaving only theresolution errors of gain, nonlinearity, and noise, thus allowingfull 14-bit accuracy.Note that for the homebrew circuit, the OP07 specifications fornput voltage offset and noise have been multiplied by √2. Thisis because a three op amp type in-amp has two op amps at itsnputs, both contributing to the overall input error.R = 350Ω10VPRECISION BRIDGE TRANSDUCERR = 350Ω R = 350ΩR = 350Ω00775-0-039AD620A MONOLITHICINSTRUMENTATIONAMPLIFIER, G = 100SUPPLY CURRENT = 1.3mA MAXAD620A RG499ΩREFERENCE 00775-0-040
Figure 37. Make vs. Buy
"HOMEBREW" IN-AMP, G = 100
 *0.02% RESISTOR MATCH, 3ppm/°C TRACKING
**DISCRETE 1% RESISTOR, 100ppm/°C TRACKING
 P07D00775-0-041Table 4. Make vs. Buy Error Budget
Error, ppm of Full ScaleError Source AD620 Circuit Calculation “Homebrew” Circuit Calculation AD620 HomebrewABSOLUTE ACCURACY at TA = 25°C
Input Offset Voltage, μV 125 μV/20 mV (150 μV × √2)/20 mV 6,250 10,607Output Offset Voltage, μV 1000 μV/100 mV/20 mV ((150 μV × 2)/100)/20 mV 500 150
Input Offset Current, nA 2 nA ×350 Ω/20 mV (6 nA ×350 Ω)/20 mV 18 53CMR, dB 110 dB(3.16 ppm) ×5 V/20 mV (0.02% Match × 5 V)/20 mV/100 791 500
Absolute Error 7,559 11,310
DRIFT TO 85°C
Gain Drift, ppm/°C (50 ppm + 10 ppm) ×60°C 100 ppm/°C Track × 60°C 3,600 6,000
Input Offset Voltage Drift, μV/°C 1 μV/°C × 60°C/20 mV (2.5 μV/°C × √2 × 60°C)/20 mV 3,00

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